Azo dye.



being by weig t:

UNITED STATES PATENT OFFICE.

OSCAR GUNTHER AND LEOPOLD HESSE, OF ELBERFELD, GERMANY, ASSIGNORS TO FARBEN- FABRIKEN VORM. FRIEDR BAYER & 00., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

Application filed February 11, 1909. Serial No. 477,286. f"

To all whom it may concern:

Be it known that we, OSCAR GI'JNTHER and LEOPOLD HnssE, doctors of philosophy, chemists, citizens of the German Empire, re-

5 siding a't-Elberfeld, Germany, Kingdom of Prussia, have invented new and useful Improvements in Azo Dye, of which the follow-' ing is a specification.

Our invention relates to the manufacture and production of new coloring matters capable of dyeing wool. The new dyestuffs are obtained by combining the diazo compound of para-nitranilin-ortho-sulionic acid with naphthalene compounds having the (R meaning hydrogen or a substituent, X

The new products possess the valua 1e property that'they produce on wool pure reddish-violet to blue shades fast to light and to washing and possessing excellent leveldyeing properties.

The new dyestuffs are after being dried and pulverized in the sha e of their alkaline salts dark powders solub e in water generally with a red to violet color. They 'yield upon reduction with stannous chlorid and hydrocholric acid parahenylenediamin-sulionic acid and na htha ene diamins having the general formu a:

-i Own mum (X, Y and R having the above given meancarrying out our new process practically we can roceed as follows, the parts Erample: 235 arts of the ammonium salt of para-nitrani in-orthq-sulfonic acid are dissolved in water and diazotized at about 10 C. by means of 69 parts of sodium nitrite and 5 arts of a 20 per cent. hydrochloric acid. Tie diazo compound is introduced into a solution of 208. arts of beta-ethylnaphthylamin hydroch orid. Sodium aceso tate is added, the dye is filtered 03 and dried.

'lt is in the shape ofi its sodium salt a blackbrown powder soluble in water with a violet color and soluble in concentrated sulfuric Specification of Letters Patent.

and Y meaning hydrogen or a sulfonic grou AZO DYE.

Patented May 11, 1909.

; acid with an-orange color. The new dye yields upon reduction with stannous chlorid and hydrochloric acid para-phenylenediaminsulfonic acid and 1-am1no-2-ethylan1inonaphthalene. fast to light and to washing.

Instead of beta-ethylnaphthylamin other of the above mentioned )roducts, e. g. betanaphthylamin, beta p betanaphthylamin5, 6- or 7-sulfonic acid, beta-naphthylamin-3.6disulfonic acid, betaethylnaphthylamin-7 sulfonic acid, betaphenylnaphthylamin-5.7-disulfonic acid etc. can be used. I

Having now described our invention and in what manner the same is to be performed, What we claim as new and desire to'secure. by Letters Patent is 1. The herein described azodyestufi's, obtainable from para-nitranilin-ortho-sulfonic acid and. naphthalene compounds of the above given formula, which dyestuffs are, after bein dried and ulverized in the sha e of their al 'aline salts ark powders soluble in water generally with a red to violet color; yielding upon-reduction with stannous chlorid and hydrochloric acid para-phenylencdiamin-sulfonic acid. and diaminonaphthalenes having the above given formula; and dyeing wool from reddish-violet to blue shades, substantially as described.

2. The herein-described new azod estuif obtainable from para-nitranilin-ort o-sulfonic acid and beta ethyl naphthylamin, which dyestuii' is, after being dried and pulverized in the sha e of its sodium salt ablackbrown powder so uble in water with a violet color and soluble in concentrated sulfuric acid with an orange color; yielding u on reduction with stannous chlorid and dro- .chl0ric acid para-phenylenediamin-su fonic acid and 1-amino-2-ethylaminonaphthalene; and dyeing wool bluish-violet shades fast to light and to washing, substantially as described.

In testimony whereof we have hereunto set our hands in the presence of two subscribing witnesses. u OSCAR GUNTHER; [L. s.] LEOPOLD HESSE. [L. s.]

Witnesses:

OTTO'KONIG, H. KtiPPER.

It dyes wool bluish-violet shades enylnaphthylamin, 

